package com.huo.community.quartz;

import com.huo.community.entity.DiscussPost;
import com.huo.community.service.DiscussPostService;
import com.huo.community.service.ElasticsearchService;
import com.huo.community.service.LikeService;
import com.huo.community.util.CommunityConstant;
import com.huo.community.util.RedisKeyUtil;
import org.quartz.Job;
import org.quartz.JobExecutionContext;
import org.quartz.JobExecutionException;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.BoundSetOperations;
import org.springframework.data.redis.core.RedisTemplate;

import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Date;

public class PostScoreRefreshJob implements Job, CommunityConstant {

    private static final Logger logger = LoggerFactory.getLogger(PostScoreRefreshJob.class);

    @Autowired
    private RedisTemplate redisTemplate;

    @Autowired
    private DiscussPostService discussPostService;

    @Autowired
    private LikeService likeService;

    @Autowired
    private ElasticsearchService elasticsearchService;

    private static final Date epoch; //牛客纪元

    static {
        try {
            epoch = new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").parse("2014-08-01 00:00:00");
        } catch (ParseException e) {
            throw new RuntimeException("初始化牛客纪元失败！", e);
        }
    }

    @Override
    public void execute(JobExecutionContext jobExecutionContext) throws JobExecutionException {
        String redisKey = RedisKeyUtil.getPostScoreKey();
        BoundSetOperations operations = redisTemplate.boundSetOps(redisKey);
        if (operations.size() == 0) {
            logger.info("任务取消！没有需要刷新的帖子");
            return;
        }
        logger.info("任务开始，正在刷新帖子分数" + operations.size());
        while (operations.size() > 0) {
            this.refresh((int) operations.pop());
        }
        logger.info("任务结束，帖子分数刷新完毕");

    }

    private void refresh(int postId) {
        DiscussPost discussPost = discussPostService.selectDiscussPostById(postId);
        if (discussPost == null) {
            logger.error("该帖子不存在" + postId);
            return;
        }
        //是否精华
        boolean wonderful = discussPost.getStatus() == 1;
        int commentCount = discussPost.getCommentCount();
        long likeCount = likeService.findEntityLikeCount(ENTITY_TYPE_POST, postId);
        //计算权重
        double w = (wonderful ? 75 : 0) + commentCount * 10 + likeCount * 2;
        //分数=帖子权重+距离天数
        double score = Math.log10(Math.max(w, 1)) +
                (discussPost.getCreateTime().getTime() - epoch.getTime() / (1000 * 3600 * 24));
        //跟新帖子分数
        discussPostService.updateScore(postId, score);
        //同步搜索的数据
        discussPost.setScore(score);
        elasticsearchService.saveDiscussPost(discussPost);
    }
}
